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(NoModel.)

, W. H. HILDEBRAND.

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UNITED STATES PATENT OFFICE.

VILHELM II. IIILDEBRAND, OF INDIANAPOLIS, INDIANA.

FOUNTAIN-PEN.

SPECIFICATION forming part; of Letters Patent No. 348,395, dated August31l 1886.

Application filed MaylT, 1866. Serial No. 202,420. (No model.)

To aZZ whom, it may concern:

Be it known that I, WILHELM H. HILDE- BRAND, a citizen of the UnitedStates,residing at Indianapolis, in the county of Marion and State ofIndiana, have invented a new and use ful Improvement iu Fountain-Pens,of which the following is a specification.

My invention relates to an improvementin that class of fountain-pens inwhich ink is supplied to the pen-point from a reservoir formed in thepelrstock.

The object of my improvement is to prevent variations of volume in theair contaiuedin the ink-reservoir from interfering with the regular iiowof the ink.

rlhe accompanying drawings illustrate my invention.

Figure lis a front elevation. longitudinal section at a, Fig. l.

A is an open tube, which forms the ink-reservoir and also the pen-stock.

B is the pen-holder, which isadapted to receive and hold the ordinarypen-point, C. Said pen-holder is screwed into and closes one end of tubeA, and a short tube, d, conducts the ink from the reservoir-to thepenpoint.

D is an air-chamber,which is screwed into and closes the upper end oftube A. A tube, E, of small diameter, extends from the bottom of chamberD nearly to the opposite end ofthe reservoir, and a second tube, F, issccured lo the side ol' tube E, and communicates with the interior ofsaid tube E at e, and with the reservoir at f. The lower end of tube Fisclosed by a plug, z', which, for the purpose of cleaning the tube, isremovable. Near the lower end of tube Z is a valveseat, j, to which isfitted a conical valve, k. Valve l; is mounted on a Valve-rod, Z, whichpasses through tubes (Z and E and air-chamber D, and out throughashorttube, m, which has aninteriorscrew-thread. The upper end of Fig. 2is a rod Z is screw-threaded, and engages the tube m, the valve Zt beingopened and closed by A portion ofthe screwturuing the rod.

threaded portion of rod Z is cutaway along one side, to permit the airto pass into or out of chamber D.

a is a cup-shaped collar secured to rod Z, for 5o the purpose ofintercepting any ink which may work outward along the rod. The lower endof tube E is contracted so as to it closely to the rod Z, and preventthe ink from passing from the reservoir into said tube.

In operation, reservoir A having been nearly iilled with ink, valve leis opened by screwing rod Z outward, and the ink flows through tube (Z,and is discharged on the under side of the pen-point. As the ink ilowsout 6o of reservoir A, its place is filled by air from chamber D,passing through tubesE and F to the upper part of the reservoir. In casethe air in the reservoir becomes heated and thereby expanded, instead ofcausing a greater pressure on the ink, and an increased iow, asheretofore in this class of pens, the eXtra volume of air passes out ot'the reservoir through tubes F and E. Vith this construction, valve Zthaving been once adjusted t0 per- 7o mit the ow of a suitable supply ofink, a regular flow is maintained u'ntil the reservoir is emptied.

I claim as myinvention- 1. In a fouiitaiupen, a reservoir, A, airchamberD, and tubes E and F, communicating at e, all combined and arranged toco-operate as and for the purpose specified.

2. In afountain-pen, the ink-reservoir, the air-chamber, tubes E and F,communicating 8o at e, the detachable pen-holder having tube d, providedwith an interior valve-seat, the valve, the valve-rod extending throughtubes eZ and E, and means, substantially as shown and described, foradjusting said valve-rod and valve, all combined and arranged to cooperate as specified.

VIIIIIEIJM II. HILDEBRAND.

Vit nesses:

H. I). Hoon, V. M. Hoon.

